S51 - S59
Reserved
Chapter Eight - AT COMMAND SET SUMMARY
An AT command is a command issued by the computer/terminal to the modem through the
RS232 serial port in asynchronous data format when the modem is in command state. An `AT'
command prefix (ATtention) precedes each command line, except in the case of `A/', `A>>', and
`+++'. The `A/' re-executes the last command once. `A>>' re-executes the last command once,
and repeats the last call up to 9 times until aborted by physically pressing any key on the
keyboard or front panel or until a successful connection with a remote modem has been made.
These commands are not preceded by AT or followed by characters. Up to 40 commands can be
entered in a single command line with a single AT prefix.
`+++' is the escape sequence code that is entered in data state and the modem will return to
command state.
BASIC AT COMMAND SET
Following is a list of the basic AT command set. Each command should be entered following an
AT prefix. A `+' mark placed before an AT command in the list indicates that it is a default
setting.
A
Answer mode on-line. (See also S39b2).
+
B0
Select CCITT V.22 for 1200 bps communication (Default).
B1
Select Bell 212A for 1200 bps communication.
D
Enter originate mode, dial number that follows, attempt to go on-line.
Digits and modifiers that can be used with the D command:
0-9,#,* Digits for dialing.
P
Pulse dial.
T
Tone dial.
W
Wait for second dial tone.
R
Originate a call in answer mode. Entered as the last digit.
,
Pause for a time designated by S8.
;
Return to command state after dialing.
@
Wait for a 5-second silence before proceeding, otherwise return `NO
ANSWER'.
!
Hook flash (call transfer).
DL
Dial the last-dialed number.
DSn
Dial number stored in EEPROM at location n(0-9). S44.3=1 enables cyclic dial.
If the first dial is not successful, it will cycle dial through all the numbers stored in memory.
E0
Disable character echo in command state.
+
E1
Enable character echo in command state (Default).
H0
Go on-hook (hang-up). Same as ATH.
H1
Go off-hook.
